Disclaimer :
This post is just here for your information. I don't want to create another thread or flames war about the good/bad ac3-in-mp4 trick. Have a look at this if you want to speak about that.
These kind of files are playable only with the Haali Splitter and of course an AC3/DTS decoders just like AC3Filter or FFdshow bundle. Don't ask me something about this in sap support. I'll recall only for dshow players here.
How-to:
- Grab the last Haali Media splitter package here :: http://haali.cs.msu.ru/mkv/
- Install it and go to in his directory to launch gdsmux application. This is a smart interface to mux some media files with the help of Haali directshow filters. You can do this also manually through GraphEdit but I'm sure that it's more users friendly with an interface.
- Then, add your input files (right click in the 1st tab). I've tested this successfully with avc/asp/avi/ts video files and ac3/dts audio streams.
- At last, save your output file (don't forget the .mp4 extension) and click on "Start" button.
Quelle: http://forum.doom9.org/showthread.php?t=124175
Findet der ein oder andere eventuell so interessant wie ich. 
Cu Selur